CogNet (MIT)
Full Text, "a collection of searchable electronic texts for cognitive and brain sciences", including reference books, journals and over 500 books.
Books are "read only", cannot be printed.
Philosophy
Philosopher's Index
Abstracts with full text links, updated quarterly, 1940. Covers books and journals in the areas of ethics, aesthetics, social philosophy, political philosophy, epistemology, and metaphysical logic as well as material on the philosophy of law, religion, science, history, education, and language.
PhilPapers
Comprehensive index and bibliography DB, Archives from the 1800's to present. Journals, books, the largest open access archive in philosophy and researchers' blogs and pre-publishing discussions.
Web of Science (WOS)
Abstracts with full text links, from 1965. Search by cited author. Linked to JCR (Journal Citation Report).